The backup power your business depends on may be less reliable than you think.
Several years ago, engineers at a Microsoft data center in the Netherlands detected voltage sags and swells on the utility grid. In response, they transferred load from grid power to backup generators.
The generators didn't take over as expected.
A failure in the electrical distribution system prevented some of the facility's generators from picking up load. What followed was a nearly two-hour outage affecting Microsoft Azure customers across the West Europe region.
If it can happen to Microsoft, it can happen to anyone.
Power issues remain the single leading cause of serious and severe data center outages, responsible for 54 percent of the most impactful incidents tracked in the Uptime Institute's Annual Outage Analysis 2023. And the consequences are getting more expensive. Nearly half of operators surveyed in the report estimated the total cost to their organization in 2022 was between $100,000 to $1 million, with one in four reporting losses exceeding $1 million.
(Source: The Uptime Institute Annual Outage Analysis, 2023)
Most commercial diesel generators are rated for 10,000 to 30,000 hours of operation.
In a standby role, where the unit runs only during outages and scheduled tests, that can translate to 20 or even 30 years of service life on paper. But rated lifespan assumes consistent, proactive maintenance, including load testing and fuel management.
What we see in the field is more often aging generator sets that have been treated as set-it-and-forget-it insurance policies, quietly sitting in mechanical rooms or equipment yards, assumed to be ready until they aren't.
Age compounds every failure mode. Here are the ones that matter most.
Why Do Commercial Generators Fail?
Diesel fuel begins to break down within six to twelve months in storage. Water condensation introduces microbial growth. Sediment builds up.
Oxidized fuel clogs injectors and filters. The National Fire Prevention Association notes that poor fuel quality and contamination are among the most common causes of generator failure.
In high-humidity environments — and particularly in Florida — this degradation accelerates.
When Hurricane Ian tore through Southwest Florida in 2022, more than 2 million customers lost power for days.
Facilities with stored fuel sitting in tanks discovered, at the worst possible time, that the fuel they counted on had degraded beyond reliable use, and a disrupted supply chain made it difficult to get more.
Many large generators are paired with an uninterruptible power supply (UPS) system to reduce the risks of outages, but these systems are only as good as the batteries that power them.
The Uptime Institute’s 2023 analysis found about 40% of diesel generators failed because of UPS system failures.
The irony is that standby generators are especially prone to battery degradation because they sit idle most of the time. Batteries in continuous-use applications cycle regularly, which helps maintain their charge capacity. In standby mode, batteries rarely cycle and terminals can become corroded.
Monthly voltage checks and proactive replacement every two to three years are standard recommendations. In practice, battery health is often the last thing on a facilities team's inspection list.
Overheating is one of the fastest ways to destroy a generator engine. Blocked radiators, low coolant, failed hoses, and broken thermostats all contribute to commercial generator failure.
In a prolonged outage where a generator must run continuously for several days, even a minor cooling system issue can be catastrophic.
Routine maintenance catches these problems, but cooling system checks require the generator to actually be running under load.
Load testing is critical to ensuring generators are ready for the unexpected, but many companies don’t do these often enough or with a large enough load.
Running at low or no load causes a condition called wet stacking — a buildup of unburned fuel in the exhaust system that fouls injectors, damages emissions components, reduces engine performance, and shortens engine life.
Annual load bank testing under real operational conditions is the industry standard for identifying wet stacking and other performance issues before they cause a failure.
The Microsoft Azure incident is an example of this failure mode. The grid sent a disturbance. The system responded by initiating a transfer to generators. Then the transfer didn't complete as designed.
Automatic transfer switches and generator control systems can fail due to wiring degradation, corrosion, software faults, or settings that haven't been reviewed since original installation.
There's also an important engineering distinction worth understanding.
Many commercial systems are configured for fault protection, meaning they shut down or fail to transfer when they detect an anomaly. Systems designed for fault ride-through are engineered to stay online and complete the transfer through disturbances rather than tripping offline at the first sign of trouble.
This is a design and configuration issue companies need to consider prior to commissioning their generators.
When it comes to the reliability of backup generators, we can’t ignore the human factor.
The Uptime Institute's more recent Annual Outage Analysis 2025 found that 58% of outages failed because of people failing to follow established procedures — a 10% increase from the previous year.
Diesel generators require regular service, including oil and filter changes, coolant checks, AVR testing, and fuel system inspections.
Every deferred task is a compounding risk. In a facilities environment where teams are stretched thin and the generator hasn't caused a problem in years, it's easy to let that schedule slip.
A generator that's too small will struggle under full facility load, causing voltage sags that can damage sensitive equipment and trigger shutdowns.
A generator that's too large will run chronically underloaded, accelerating wet stacking and mechanical wear.
This is frequently a specification problem that originates at installation.
Without a current load analysis, there's no way to know whether the generator protecting your operations was properly sized for them in the first place.
Individually, each of these failure modes is manageable. Collectively, they paint a picture of backup power infrastructure far more fragile than most organizations assume.
According to the Uptime Institute, power issues have been the leading cause of serious and severe data center outages for years running — and the costs when things go wrong continue to climb.
A single generator failure can result in SLA violations that cost enterprises $300,000 to $5 million per hour in penalties and recovery, according to a report by support center software SupportBench, with potential hardware damage exceeding millions of dollars.
The same risks apply outside of data centers.
For manufacturing facilities, a generator failure during a prolonged outage potentially means halted production lines, spoiled inventory, and wasted labor costs while everyone waits for the equipment to restart.
For multi-family residential buildings, it means failed elevators, dark common areas, and potential liability.
For healthcare-adjacent facilities, the stakes are even higher.
Preventive maintenance can go a long way to reduce the likelihood of these issues. But it's also worth asking whether diesel generation is still the right long-term solution for facilities that can't afford even momentary disruptions in power.
Most generators are a sunk cost companies carry with little to no return most of the time.
They require regular maintenance and inspections and refueling, and they often take up a lot of real estate. For data centers, generators and electrical components can take up as much as 50% of the property, potentially preventing further expansion.
Most diesel generators aren’t rated for long-term use and have limits of no more than 50 hours per year per US EPA limitations. They often use lead acid batteries rated for about 1,500 charging cycles, which means they’ll need to be replaced every few years.
Imagine if your facility could have all the benefits of a better backup system but use it as your primary power source during times when demand is highest and utilities charge a premium.
At e2Companies, we engineered the R3Di® System to address the structural limitations of diesel backup power while giving companies greater energy flexibility.
We combined a battery energy storage system with a natural gas generator for continuous, conditioned power that eliminates fuel degradation risk, extends battery life to 20 years, and keeps all facility loads online without interruption.
Our system uses lithium iron phosphate batteries, which are rated for 6,000 cycles, meaning they typically last three times as long as lead acid batteries.
It has a significantly smaller footprint and reduces emissions by 90% compared to diesel generators.
Find out how the R3Di® System compares to diesel.
It’s engineered for fault ride-through rather than just fault protection, helping data centers and other mission-critical facilities achieve nearly 100% uptime.
Unlike diesel generators, which are a last resort when power fails, the R3Di System is rated to run prime so you can avoid high demand charges when power is at a premium and take advantage of utility rate incentives.
The reduction in peak charges and the additional revenue stream adds up. For instance in the PJM market, a mid-sized industrial facility reduced its demand charges by over 99%, saving more than $180,000 annually.
And a large entertainment venue in Florida is on track to cut more than $400,000 in demand charges each year while earning more than $3 million annually from utility incentives.
Our system is also paired with AI-powered monitoring software and a network operations team that works 24 hours a day, seven days a week to ensure your equipment is working properly and being deployed strategically.
Power issues remain the leading cause of serious outages across industries.
If your current backup power strategy relies on aging diesel infrastructure and you’d like to explore how schedule a consultation with our team.